This is basic stuff but I cannot figure it out, please help!

All I want to do is enable attachments on a layer that I can put in a map, and then push the map to my mobile device. I have a feature layer that I've published from ArcMap. I then add it to AGOL. It imports as a "feature layer" with a "feature service" source. Then I can add it to a map, but its still not a "feature service". I need it to be a "feature service" (I think) because I want to add attachments to different areas of my map. What step am I missing?

Thanks, Alex